<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .content {
            display: flex;
            justify-content: space-between;
            background: yellow;
        }

        .box {
            width: 100px;
            height: 100px;
            background: red;
        }
    </style>
</head>

<body>
    <div class="content">
        <div class="box"></div>
        <div class="box"></div>
    </div>

</body>

</html>